Tristan de Gouvion Saint Cyr Investment Banker.Tristan de Gouvion Saint Cyr quotes wikipedia about a phenomenon that plays an important part in trading, called behavioral finance.
This field studies the effects of social, cognitive, and emotional factors on the economic decisions of individuals and institutions and the consequences for market prices, returns, and the resource allocation. The fields are primarily concerned with the bounds of rationality of economic agents. Behavioral models typically integrate insights from psychology with neo-classical economic theory.
Tristan de Gouvion Saint Cyr gives this video from Investpodia to illustrate the point